JP3095287B2 - Vertical drive multiple pump device for underground drainage pump station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vertical-shaft drive multiple pump unit for underground pumping stations, in particular, for example, applied to underground drainage pump station, reducing the energy footprint - a suitable underground pumping stations to save The present invention relates to a vertical drive multiple pump device.

[0002]

2. Description of the Related Art Conventionally, drainage pumping stations have been mainly constructed on the ground. However, in recent years, the effective use of the ground space has been proposed, and the construction space has remained only underground, so that the drainage pumping station has been constructed underground. The structure of a pump device installed underground according to the prior art will be described with reference to FIGS. FIG. 2 is a side view of a conventional underground pump device, and FIG.
FIG. 3 is a plan view of a conventional underground pump device in a cross section taken along line XX of FIG. 2.

[0003] In the figure, 9 is an underground waterway, 10 is an intake shaft connected to the underground waterway 9, 11 and 12 are water levels in the intake shaft 10, 13 is a discharge pipe, and 14 and 15 are directions of water flow. Is shown. 1 is a driving machine which is a driving source of the pump, 1
6 is a pump, 17 is a main shaft of the driving machine 1, 18 is a main shaft of the pump, 21 is a shaft coupling, 7 is a suction pipe, 6 is a discharge pipe 13
The gate valve 8 on the side is a gate valve on the suction pipe 7 side.

[0004] The water that has entered the intake shaft 10 from the underground conduit 9 is discharged to the discharge pipe 13 through the suction pipe 7 by the pump 16 driven by the drive unit 1. When the amount of drainage is large, a plurality of (three in FIG. 3) pumps are required as shown in FIG. If you try to cover this with one unit,
A correspondingly large pump is required, and in each case a large plane space is required. That is, the amount of underground excavation increases.

[0005] Further, since the height of the drain outlet at the outlet of the discharge pipe 13 is constant, the water level of the intake shaft 10 is changed to the water level 1 shown in FIG.
At 1 the head is high, and when the water level in the intake shaft 10 is at the water level 12 shown in FIG. 2, the head is low. However, since the pump must be estimated on the safe side against the fluctuating water level, Large capacity, high head pump. As described above, the conventional pump structure requires a large plane space for the underground drainage pumping station, and has a drawback that the pump is large and has a large capacity and a high head.

[0006]

The prior art described above does not take into account the configuration of the underground drainage pumping station and the efficient operation method of the pumps, and has a serious problem in terms of economic efficiency and effective use of energy. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has an economical pump station configuration having a small plane space, and a vertical shaft drive for an underground drainage station capable of operating pumps efficiently. It is an object to provide a multiple pump device.

[0008]

In order to achieve the above-mentioned object, a first aspect of the present invention relates to a vertical shaft driving multiplex pump device for an underground drainage pump station, which comprises a driving device serving as a driving source of a pump impeller. A joint having two or more pumps disposed in a vertical direction, wherein a main shaft of the drive unit and each main shaft of the two or more pumps are in a vertical direction and a rotary torque can be intermittently connected. Are connected by

More specifically, the two or more pumps arranged in the vertical direction are small-capacity, high-head pumps on the lower side, and large-capacity, low-head pumps on the upper side. In addition, the driving device is provided between at least two pumps disposed in the vertical direction, and has a double-hook drive configuration. Further, a discharge pipe having a flow path cross-sectional area increasing in a downstream direction is provided.

In order to achieve the above object, a second aspect of the invention relates to a vertical shaft drive multiple pump device for an underground drainage station , comprising: a drive unit serving as a drive source of a pump impeller;
Having two or more pumps arranged in a vertical direction, each impeller rotation axis of these two or more pumps being in a horizontal direction,
An orthogonal transmission mechanism that connects each connecting shaft that connects these two or more pumps in the vertical direction and the main shaft of the driving machine by a joint, and that transmits the torque of the connecting shaft of each pump to each of the impeller rotating shafts. the provided, and the orthogonal transmission mechanism and the impeller rotary shaft is obtained by connecting the intermittent capable joint torque.

[0011]

The function of the above technical means is as follows. In the first invention, since a plurality of pumps are arranged in the vertical direction instead of the horizontal direction, the underground plane space is less required than in the case of the horizontal arrangement. In addition, since the main shaft of the driving machine serving as the driving source of the pump impeller and the main shaft of each pump are connected by a joint capable of intermittent rotation torque, only the pump impeller can be rotated as necessary. And waste of energy can be prevented. Furthermore, the two or more pumps installed in the vertical direction are configured so that the lower side is a pump with a small capacity and a high head. When the water level in the intake shaft is low, the pump with the high head is operated, and the vertical shaft is operated. When the water level is high, a pump with a low head can be operated.

Generally, when the water level in the intake shaft is high, the water must be drained in a short time, and a large capacity is required. In the case where urgency is required, a pump with a high head may be operated at the same time. The type of the pump impeller is determined by the capacity and the head, and there is an optimal type of the impeller for the combination. The combination of the specifications of large capacity and low head and small capacity and high head adopted in the present invention is a reasonable ideal combination, and the impeller can exhibit its ability efficiently.
That is, energy can be used effectively. In addition, the drive is placed between two vertically arranged pumps,
The structure was simplified as a double-hanging drive. Also, in this case, it is possible to provide a degree of freedom such that only the lower pump is incorporated in the initial stage of installation, and the upper pump is added later.

According to the second aspect of the present invention, the rotation shafts of the two or more pumps disposed in the vertical direction are set to be horizontal, so that the axial impeller or the mixed flow impeller is used as the pump impeller. Can be incorporated. Further, since two or more pumps arranged in the vertical direction have the same structure, the concept of a package type can be realized, and the expansion can be easily performed, and the product cost can be reduced. The height of the drainage outlet at the outlet of the discharge pipe is constant, and the water in the intake shaft works as a push, so the head required for each vertical pump is the same regardless of the water level. There is no particular new problem even if the pumps have the same structure.

Next, the reason why a discharge pipe having a flow path cross-sectional area increasing in the downstream direction is provided will be described. Generally, when a plurality of pumps are operated in parallel, the expected performance may not be obtained. This will be described using FIG. 4 as an example in which two identical pumps are operated. FIG. 4 is a diagram illustrating performance when two pumps are operated. In FIG. 4, the horizontal axis indicates the flow rate Q and the vertical axis indicates the total head H, and the performance curve for one-unit operation is shown by a solid line, and the performance curve for two-parallel operation is shown by a broken line.

The intersection of the performance curve representing the relationship between the flow rate and the head and the resistance curve representing the magnitude of the load on the pump is the operating point of the pump. The operating point when one vehicle is operating is A and 2
The combined performance curve during the vehicle operation is as shown by the broken line. In two-unit operation, the operating point is B
Becomes In other words, the flow rate is not only to Q _B also to meet two. In per one is a Q _C. Therefore, the sectional area of the discharge pipe is enlarged to change the resistance curve. The resistance curve when the cross-sectional area of the discharge pipe is enlarged changes as shown in the figure.
The intersection with the performance curve at the time of the two-car operation is D. That is,
It can be obtained flow rate Q _D. For the above reasons, a discharge pipe whose flow cross-sectional area increases in the downstream direction is provided.

[0016]

[Example 1]

First, an example of the first invention will be described with reference to FIG. FIG.
1 is a sectional view of an underground pumping station in which a vertical drive multiple pump device according to one embodiment of the present invention is arranged. In the figure, components having the same reference numerals as those in FIG.

In FIG. 1, reference numeral 1 denotes a driving machine serving as a driving source of a pump impeller (not shown), and a main shaft 17 thereof is in a vertical direction. 2 is a large capacity, low head pump, and 3
Is a small-capacity, high-yield pump that is installed vertically. Reference numeral 4 denotes a joint capable of intermittent rotation torque. The main shaft 17 of the driving machine 1 is connected to the main shafts 18 of the two pumps 2 and 3 arranged in the vertical direction by the joint 4.
That is, the drive unit 1 is located between the two pumps 2 and 3 arranged in the vertical direction, and has a double-hook drive configuration (not shown in detail).

Reference numeral 9 denotes an underground waterway, 10 denotes an intake shaft provided to be connected to the underground waterway 9, and 13 denotes a discharge pipe relating to a discharge flow path. Between the intake shaft 10 and the discharge pipe 13, a vertical drive multiple pump device comprising two or more (two in FIG. 1) pumps arranged in the vertical direction is provided. The suction pipe 7-1 of the upper pump 2 is connected to the upper part of the intake shaft 10 through the gate valve 8-1, and the lower pump 3
Is connected to the lower part of the intake shaft 10 through a gate valve 8-2. The discharge sides of the pumps 2 and 3 are connected to a discharge pipe 13 via gate valves 6-1 and 6-2.

The water that has flowed through the underground headrace channel 9 and accumulated in the intake shaft 10 is supplied to the suction pipe 7 (7-1, 7-2) when the gate valve 8 (collectively 8-1 and 8-2) is open. ) And is discharged to a discharge pipe 13 by a pump. The discharge pipe 13 has an enlarged cross-sectional area from the position where the discharge flows of the large-capacity, low-head pump 2 merge. Discharge side gate valve 6 (6-1, 6
-2) is closed when the pump is stopped to prevent reverse flow of the discharge flow. Also, 14 and 15 are water flow directions,
Reference numerals 1 and 12 indicate water levels.

Since the present embodiment is constructed as described above, the plane space of the underground drainage pump station is less required than in the case of the conventional horizontal arrangement of pumps. Also,
Since the main shaft 17 of the driving machine 1 and the main shafts 18 of the pumps 2 and 3 are connected by the joint 4 capable of turning on and off the rotational torque, only the pump impeller can be rotated if necessary, and the energy Waste can be prevented.

Further, the two pumps 2, 3 arranged in the vertical direction are configured such that the upper side is a large-capacity, low-head pump 2 and the lower side is a small-capacity, high-head pump 3.
When the water level of the intake shaft 10 is low, the pump 3 with a high head is operated, and the water level of the intake shaft 10 is high 12
In this case, the pump 2 with a low head can be operated.
In addition, they can be operated simultaneously.

Further, the drive unit 1 has a simplified structure as a double-hanging drive. In addition, since the discharge pipe whose flow path cross-sectional area increases in the downstream direction is provided, efficient operation is possible. Furthermore, since one discharge pipe 13 can be used in combination for a plurality of pumps, there is an effect that the configuration of the pump device is simplified. According to this embodiment, when the large-capacity low-head pump 2 is not operated, the gate valves 6-1 and 8-1 before and after the pump 2 are closed to drain water, and the pump 2 acts as a flywheel. This has the effect of saving energy and preventing water hammer.

Embodiment 2 Another embodiment of the present invention (an example of the second invention) will be described with reference to FIG. FIG. 5 is a cross-sectional view of an underground pump station provided with a vertical-axis drive multiple axial-flow pump device according to another embodiment of the present invention. In the figure, components having the same reference numerals as those in FIG. 1 are the same as those in the previous embodiment, and the description thereof will be omitted. In the embodiment shown in FIG. 5, the impeller rotation axes of the three pumps 20 arranged in the vertical direction are in the horizontal direction, and the three pumps 20 have the same structure.

In FIG. 5, 1A is a driving machine serving as a driving source of a pump (or a pump impeller), 17A is a main shaft of the driving machine 1, and 20 is two or more machines arranged in a vertical direction (FIG. 5). In the example, three axial pumps, 17B are connecting shafts connecting these axial pumps 20 in the vertical direction, and 21 is a connecting shaft.
This is a shaft coupling for connecting the main shaft 17A of the driving machine 1 and each connection shaft 17B of the axial flow pump 20. The axial pump 20
An axial-flow impeller 19 and guide blades 22 and 23 are provided. 18A is a rotation axis of the impeller 19 in a horizontal direction.

Reference numeral 24 denotes a bevel gear of the orthogonal transmission mechanism for transmitting the torque of the connecting shaft 17B to the rotary shaft 18A of each of the impellers, and reference numeral 25 denotes an opening for shaft penetration provided in the casing of the axial flow pump. The rotating shaft 18A of each impeller and the bevel gear 24 are connected by a joint 4 capable of intermittently rotating torque. There is a pump chamber between the intake shaft 10 connected to the underground water conduit 9 and the discharge pipe 13, and a vertical shaft composed of two or more (three in FIG. 5) axial flow pumps 20 arranged in the vertical direction. A driving multi-axial pump device is provided. The upstream side of each axial flow pump 20 is connected to the intake shaft 10 via the gate valve 8,
The downstream side communicates with the discharge pipe 13 through the gate valve 6.

In the case of the embodiment shown in FIG. 5, similarly to the embodiment shown in FIG. 1, an economical pump station configuration and efficient operation of the pumps are enabled.
Since the nine rotating shafts 18A are arranged horizontally, the pump impeller is not limited to the axial-flow impeller, and it is also possible to incorporate a mixed-flow impeller. In this embodiment, the height of the drain at the outlet of the discharge pipe 13 is constant, and the water in the intake shaft 10 acts as a push. The head required for the pump 20 is the same, and the pumps can have the same structure. In addition, since the pumps have the same structure, the concept of a package type can be considered, and there is an effect peculiar to the present embodiment that the pump can be easily added and the product cost can be reduced.

[0027]

As described above in detail, according to the present invention, an economical pump station configuration having a small plane space,
Also, it is possible to provide a vertical drive multiple pump device for an underground drainage pump station that enables efficient operation of the pump.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an underground pump station provided with a vertical-axis drive multiple pump device according to an embodiment of the present invention.

FIG. 2 is a side view of a conventional underground pump device.

FIG. 3 is a plan view of a conventional underground pump device taken along a line XX in FIG. 2;

FIG. 4 is a diagram illustrating performance when two pumps are operated.

FIG. 5 is a cross-sectional view of an underground pump station provided with a vertical-axis driven multiple axial-flow pump device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Drive machine 2, 3 Pump 4 Coupling 9 Underground waterway 10 Intake shaft 13 Discharge pipe 17, 17A Main shaft 17B Connecting shaft 18 Main shaft 18A Rotating shaft 19 Impeller 20 Axial pump 21 Shaft coupling 24 Bevel gear

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunio Takada 603, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant, Hitachi, Ltd. (56) References JP-A-3-222894 (JP, A) JP-A-57-88290 (JP, A) JP-A-53-75503 (JP, A) JP-A-57-13290 (JP, A) JP-A 2-119994 (JP, U) JP-A 53-15102 (JP, U) JP-A 58-167793 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 13/14 F04D 13/00 F04D 15/00

Claims (6)

(57) [Claims] A driving device serving as a driving source of a pump impeller;
It has two or more pumps arranged in the vertical direction, and a main shaft of the drive unit and each main shaft of the two or more pumps are in a vertical direction and can be connected and disconnected by a rotational torque. A vertical drive multi-pump device for an underground drainage station, which is connected. 2. The pump according to claim 1, wherein the two or more pumps arranged vertically have a small capacity and a high head pump on the lower side and a large capacity and a low head pump on the upper side. A vertical drive multiple pump device for an underground drainage station according to the above . 3. The vertical drive multiple pump device for an underground drainage station according to claim 1, wherein the drive device is located between at least two vertically arranged pumps and is a double-hook drive. 4. The underground drainage machine according to claim 1, further comprising a discharge pipe having a flow path cross-sectional area increasing in a downstream direction.
Vertical shaft drive multiple pump device for the field . 5. A driving device serving as a driving source of a pump impeller;
And two or more pumps arranged in a vertical direction, each impeller rotation axis of these two or more pumps being in a horizontal direction, and each connecting shaft connecting these two or more pumps in a vertical direction. An orthogonal transmission mechanism for connecting the main shaft of the driving machine with a joint and transmitting the torque of the connection shaft of each pump to each of the impeller rotation shafts is provided, and the orthogonal transmission mechanism and the impeller rotation shaft are rotated. A vertical drive multiple pump device for an underground drainage pump station, wherein the pump is connected by a joint capable of interrupting torque. 6. A vertical shaft drive multiplex pump device for an underground drainage station according to claim 1, which is disposed between an intake shaft connected to the underground headrace and a discharge passage. Underground drainage pump station.